cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations wctype/towupper_l.c -o wctype/towupper_l -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
wctype/towupper_l.c:5:35: error: ‘towupper_l’ undeclared here (not in a function); did you mean ‘towupper’?
    5 | wint_t (*foo)(wint_t, locale_t) = towupper_l;
      |                                   ^~~~~~~~~~
      |                                   towupper